Inspection fixture



I United States Patent 11113,549,009

[72] Inventor John W. Potts [56] References Cited North Caldwell, UNITEDSTATES PATENTS I211 APPl- M 815735 1421715 7/1922 Puc 209/109 [221 Filed74 8 2 1930 T k 4s Patented Dec. 22, 1970 fiche [73] Assignee UnitedStates ofAmerica, as represented by m y Examiner-Richard h r theSecretary of the Army Att0rneys-Harry M. Saragovitz, Edward J. Kelly,Herbert Her! and S. Dubroff ABSTRACT: An inspection fixture for gaugingprimer tubes [54] INSPFCTION FIXTUPE having its sidewall formed withpredetermined flash holes. The 3 Chums 2 Drawing F tube is rolledlengthwise as guided by a pair of longitudinally [52] US. Cl. 209/110,extending opposed channels formed by sidewall constructions 2091123secured to a base member. The base contains a plurality of up- [Sl] Int.Cl. 1307c 9/00 standing pins at predetermined locations and whichprotrude [50] Field of Search 209/80, above the base upper surface. Thepins will be received by the 109, 1 i0, 123, 126 flash holes of anacceptable primer tube.

zo'aemox PATENTED DEC22 lsm ZO'APPROX v INVENTOR. JOHN W. POTTSATTORNEYS INSPECTION FIXTURE The invention described herein may bemanufactured, used, and, licensed by or for the Government forgovernmental purposes without the payment to me of any royalty thereon.

This invention relates to fixtures, and more particularly, to a fixturethat facilitates inspection of primer tubes having predetermined flashholes. 1

It is an object of the invention to provide a test or gaging fixture bywhich primer tubes can rapidly be inspected and readily be accepted orrejected.

Another object of this invention is to provide such an inspectionfixture that smoothly accepts satisfactory primer tubes which are rolledthrough the fixture.-

These and other objects, features, and advantages will become moreapparent from the following description and accompanying drawings inwhich:

FIG. 1 is a perspective view of the fixture embodying the principles ofthe invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 with a primertube in position for inspection.

The inspection fixture, shown generally at (FIG. 1), has a base memberI] with an upper surface 12 provided with a plurality ofpredeterminately located vertical apertures for selecv tively receivingor mounting the shaft portions of designated bulletlike pins 13. Thepins 13 are of predetermined dimensions in diameter and length so as toprotrude uniformly a predetermined distance above the base upper surface12 to be readily received in the flash holes 14 (FIG. 2) of a primertube sidewall when an acceptable or satisfactory primer tube 15 isrolled longitudinally through the fixture. During inspection operationof the fixture base 11 preferably-has its rearward end elevated by means(not shown) such that the test specimens can roll forwardly down anapproximate 20 incline or grade. The bullet'shaped or tapered ends ofpins 13 facilitate entry and exit with the acceptable primer tube flashholes. Rejected tubes will not roll smoothly through the fixture.

Extending longitudinally along the, side. edges of the base member 11and positioned laterally of the pins 13 are a pair of parallel sidewallmembers 16, 17 each of which is appropriately secured to the base member11. Eachsidewall or anvil l6, 17 has an overlying cap member 18, '19 ofrelatively less height but greater width than its corresponding sidewall16, 17. Each cap member 18, 19 is appropriately secured to and extendsalong its sidewall member l6, l7 and each cap extends inwardly of itssidewall member 1.6, 17 and each cap extends inwardly of its sidewall toprovide lengthwise extending, opposed channels that receive end portionsof a rolling primer tube. The height of side members 16, 17 preferablyis slightly greater than the outside diameter of the primer tube beinginspected.

Mounted or appropriately secured inlongitudinally extending grooves 20,21 provided in the base upper surface 12 are flexible rubber strips22,23. The properly secured flexible strips 22, 23 protrude above thebase upper surface a slight distance, but less than that of theprotruding pins 13, and run longitudinally between predetermined groupsof upstanding pins 13.

The purpose of the flexible friction strips 22, 23 is to assure that theprimer tube will roll with a minimum of slippage.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

- Iclaim: I

1. An inspection fixture for gaging primer tubes having predeterminedflash holes in the sidewall thereof, comprising:

a base member having an upper surface;

a plurality of bulletlike pins upstanding in said base member atpredetermined locations thereon and having upper end portions protrudingabove said base upper surface;

a pair of longitudinally extending parallel sidewalls positionedlaterally of said pins;

and means on said sidewalls defining lengthwise extending opposedchannels for receiving end portions of a rolling primer tube' and soconstructed and arranged that anyone of said pins will preclude forwardrolling of said primer tube unless it contains the appropriate flashholes in its sidewalls.

2. The structure of claim 1 wherein said base upper surface has aplurality of longitudinally extending flexible strips protruding abovesaid base upper surface a distance less than said protruding pins.

3. The structure of claim 3 in which said channel defining meansincludes a pair of longitudinal cap members overlying corresponding onesof said parallel sidewalls and extending inwardly therefrom.

